Well that's one way to look at it but another way is to look at it is why should I have to carry two 50mm lenses when one should be enough? My Rokkor 50mm f1.2 gives character rather than clinically sharp results at wider apertures but stopped down it's just a nice and competent enough lens, as are all of my current f1.2, 1.4, 1.8 and f2 legacy lenses. This makes them effectively dual use lenses as wide open you can get what is unequivocally older lens charm and character but stopped down they're sharp enough and good enough across the frame that the fact that they're 40 years old is pretty much irrelevant.
A lens that costs more than my Rokkor and gives character at f1.x is all well and good but if it's equally characterful stopped down to f5.6 it would be kicked over a hedge PDQ. However, there's still the fact that these 7A lenses mount either directly or via a small M adapter. I'll have another look if and when more reviews on A7x cameras come along but if it's funky at all apertures I'm not interested, YMMV, and I do anyway have the characterful Rokkor 50mm f1.2 and the excellent modern Voigtlander 40mm f1.2.
And I've just bought another old lens so my gear lust is satisfied for a few days